1、BRITISH STANDARD BS EN 61000-4-21:2003 Electromagnetic compatibility (EMC) Part 4-21: Testing and measurement techniques Reverberation chamber test methods The European Standard EN 61000-4-21:2003 has the status of a British Standard ICS 33.100.10; 33.100.20 BS EN 61000-4-21:2003 This British Standa
2、rd was published under the authority of the Standards Policy and Strategy Committee on 20 January 2004 BSI 20 January 2004 ISBN 0 580 43253 X National foreword This British Standard is the official English language version of EN 61000-4-21:2003. It is identical with IEC 61000-4-21:2003. The UK parti
3、cipation in its preparation was entrusted by Technical Committee GEL/210, EMC Policy, to Subcommittee GEL/210/12, EMC Basic and generic standards, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references T
4、he British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standa
5、rds Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the r
6、esponsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front
7、 cover, the EN title page, pages 2 to 103 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 61000-4-21 NORME EUROPENNE EUROPISCHE NORM October 2003 CENELEC
8、European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwid
9、e for CENELEC members. Ref. No. EN 61000-4-21:2003 E ICS 33.100.10; 33.100.20 English version Electromagnetic compatibility (EMC) Part 4-21: Testing and measurement techniques Reverberation chamber test methods (IEC 61000-4-21:2003) Compatibilit lectromagntique (CEM) Partie 4-21: Techniques dessai e
10、t de mesure Mthodes dessai en chambre rverbrante (CEI 61000-4-21:2003) Elektromagnetische Vertrglichkeit (EMV) Teil 4-21: Prf- und Messverfahren - Verfahren fr die Prfung in der Modenverwirbelungskammer (IEC 61000-4-21:2003) This European Standard was approved by CENELEC on 2003-10-01. CENELEC membe
11、rs are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on applicatio
12、n to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat ha
13、s the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Swe
14、den, Switzerland and United Kingdom. EN 60010-4-122:300 - - 2 Foreword The text of document CISPR/A/455/FDIS, future edition 1 of IEC 61000-4-21, prepared by CISPR SC A, Radio-interference measurements and statistical methods, in cooperation with SC 77B, High-frequency phenomena, of IEC TC 77, Elect
15、romagnetic compatibility, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61000-4-21 on 2003-10-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement
16、(dop) 2004-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-10-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annexes B, C, D, E and ZA
17、 are normative and annexes A, F, G, H, I, J are informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61000-4-21:2003 was approved by CENELEC as a European Standard without any modification. _ Page2 EN61000421:2003CONTENTS INTRODUCTION.5 1 S
18、cope.6 2 Normative references6 3 Definitions and acronyms7 4 General10 5 Test environments and limitations .11 6 Applications11 7 Test equipment.12 8 Chamber calibration13 9 Testing.14 10 Test results, test report and test conditions .14 Annex A (informative) Reverberation chamber overview .15 Annex
19、 B (normative) Chamber calibration for mode-tuning40 Annex C (normative) Chamber calibration for mode-stirring 50 Annex D (normative) Radiated immunity tests.55 Annex E (normative) Radiated emissions measurements60 Annex F (informative) Shielding effectiveness measurements of cable assemblies, cable
20、s, connectors, waveguides and passive microwave components.65 Annex G (informative) Shielding effectiveness measurements of gaskets and materials69 Annex H (informative) Shielding effectiveness measurements of enclosures.81 Annex I (informative) Antenna efficiency measurements .89 Annex J (informati
21、ve) Direct evaluation of reverberation performance using field anisotropy and field inhomogeneity coefficients .91 Annex ZA (normative) Normative references to international publications with their corresponding European publications 102 Bibliography103 Figure A.1 Typical field uniformity for 200 tu
22、ner steps.28 Figure A.2 Theoretical modal structure for a 10,8 m 5,2 m 3,9 m chamber 28 Figure A.3 Theoretical modal structure with quality factor bandwidth superimposed on 60th mode.29 Figure A.4 Theoretical modal structure with greater quality factor bandwidth (lower Q) superimposed on 60 thmode 2
23、9 Figure A.5 Typical reverberation chamber facility30 Figure A.6 Theoretical sampling requirements for 95 % confidence see equation (A.3) on calculating mode density.31 Figure A.7 Theoretical sampling requirements for reduced confidence 32 Figure A.8 Normalized PDF of an electric field component at
24、a fixed location for a measurement with a single sample32 Figure A.9 Normalized PDF of the mean of an electric field component at a fixed location for a measurement with N samples.34 Page3 EN61000421:2003Figure A.10 Normalized PDF of the maximum of an electric field component at a fixed location for
25、 a measurement with N samples.34 Figure A.11 Chamber working volume 35 Figure A.12 Typical probe data.36 Figure A.13 Mean-normalized data for x component of 8 probes .37 Figure A.14 Standard deviation of data for E-field components of 8 probes .37 Figure A.15 Distribution of absorbers for loading ef
26、fects test.38 Figure A.16 Magnitude of loading from loading effects test .38 Figure A.17 Standard deviation data for electric field components of eight probes in the loaded chamber 39 Figure B.1 Probe locations for chamber calibration .49 Figure C.1 Received power (dBm) as a function of tuner rotati
27、on (s) at 500 MHz.54 Figure C.2 Received power (dBm) as a function of tuner rotation (s) at 1 000 MHz54 Figure D.1 Example of suitable test facility .59 Figure E.1 Example of suitable test facility64 Figure F.1 Typical test set-up .68 Figure G.1 Typical test set-up.78 Figure G.2 Typical test fixture
28、 installation for gasket and/or material testing79 Figure G.3 Test fixture configured for calibration 80 Figure H.1 Typical test enclosure installation for floor mounted enclosure testing87 Figure H.2 Typical test enclosure installation for bench mounted enclosure testing .88 Figure J.1 Theoretical
29、and typical measured distributions for field anisotropy coefficients in a well-stirred chamber.98 Figure J.2 Theoretical and typical measured distributions for field anisotropy coefficients in a poorly stirred chamber99 Figure J.3 Typical measured values for field anisotropy coefficients as a functi
30、on of N in a well-stirred chamber .100 Figure J.4 Typical measured values for field anisotropy coefficients as a function of N in a poorly stirred chamber101 Table A.1 Sampling requirements.22 Table B.1 Sampling requirements.48 Table B.2 Field uniformity tolerance requirements.48 Table J.1 Typical v
31、alues for total field anisotropy coefficients for medium and good reverberation quality96 Page4 EN61000421:2003 INTRODUCTION IEC 61000 is published in separate parts according to the following structure: Part 1: General General considerations (introduction, fundamental principles) Definitions, termi
32、nology Part 2: Environment Description of the environment Classification of the environment Compatibility levels Part 3: Limits Emission limits Immunity limits (in so far as they do not fall under the responsibility of the product committees) Part 4: Testing and measurement techniques Measurement te
33、chniques Testing techniques Part 5: Installation and mitigation guidelines Installation guidelines Mitigation methods and devices Part 6: Generic standards Part 9: Miscellaneous Each part is further subdivided into several parts, published either as international standards or as technical specificat
34、ions or technical reports, some of which have already been published as sections. Others will be published with the part number followed by a dash and a second number identifying the subdivision (example : 61000-6-1). Page5 EN61000421:2003ELECTROMAGNETIC COMPATIBILITY (EMC) Part 4-21:Testing and mea
35、surement techniques Reverberation chamber test methods 1 Scope This part of IEC 61000 considers immunity and wanted and unwanted emissions tests for electric and/or electronic equipment and screening effectiveness tests. Only radiated phenomena are considered. It establishes the required test proced
36、ures for using reverberation chambers for performing radiated immunity, radiated emissions and screening effectiveness testing. The object of this part is to establish a common reference for using reverberation chambers to evaluate the performance of electric and electronic equipment when subjected
37、to radio- frequency electromagnetic fields and for determining the levels of radio-frequency radiation emitted from electric and electronic equipment. NOTE Test methods are defined in this part for measuring the effect of electromagnetic radiation on equipment and the electromagnetic emissions from
38、equipment concerned. The simulation and measurement of electro- magnetic radiation is not adequately exact for quantitative determination of effects. The test methods defined are structured for the primary objective of establishing adequate repeatability of results at various test facilities for qua
39、litative analysis of effects. This part of IEC 61000 does not intend to specify the tests to be applied to particular apparatus or system(s). Its main aim is to give a general basic reference to all concerned product committees of the IEC. The product committees are to select emission limits and tes
40、t methods in consultation with CISPR. The product committees remain responsible for the appropriate choice of the immunity tests and the immunity test limits to be applied to their equipment. This part of IEC 61000 describes other test methods than IEC 61000-4-3 and CISPR 16-2. The other methods may
41、 be used in consultation with CISPR and TC 77, if so specified by product committees. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of
42、the referenced document (including any amendments) applies. IEC 60050(161):1990, International Electrotechnical Vocabulary (IEV) Chapter 161: Electro- magnetic compatibility IEC 60068-1, Environmental testing Part 1: General and guidance IEC 61000-4-3, Electromagnetic compatibility (EMC) Part 4-3: T
43、esting and measurement techniques Radiated, radio-frequency, electromagnetic field immunity test IEC 61000-4-6, Electromagnetic compatibility (EMC) Part 4-6: Testing and measurement techniques Immunity to conducted disturbances, induced by radio-frequency fields Page6 EN61000421:2003CISPR 16-1, Spec
44、ification for radio disturbance and immunity measuring apparatus and methods Part 1: Radio disturbance and immunity measuring apparatus CISPR 16-2, Specification for radio disturbance and immunity measuring apparatus and methods Part 2: Methods of measurement of disturbances and immunity 3 Definitio
45、ns and acronyms 3.1 Definitions For the purposes of this part of IEC 61000-4, the following definitions, together with those in IEC 60050(161) apply. 3.1.1 antenna that part of a radio transmitting or receiving system which is designed to provide the required coupling between a transmitter or a rece
46、iver and the medium in which the radio wave propagates IEV 712-01-01 NOTE For the purpose of this procedure antennas are assumed to have an efficiency of 75 % or greater. 3.1.2 electromagnetic (EM) wave variations of the conditions of a material medium or vacuum, characterized by a time-varying elec
47、tromagnetic field, and moving with a velocity defined at each point and in each direction by the properties of the medium NOTE An electromagnetic wave is produced by variations of electric charges or of electric currents. IEV 121-11-63 3.1.3 far field region that region of the electromagnetic field
48、of an antenna wherein the predominant components of the field are those which represent a propagation of energy and wherein the angular field distribution is essentially independent of the distance from the antenna NOTE 1 In the far field region, all the components of the electromagnetic field decre
49、ase in inverse proportion to the distance from the antenna. NOTE 2 For a broadside antenna having a maximum overall dimension, D, which is large compared to the wave- length, , the far field region is commonly taken to exist at distances greater than 2 2D from the antenna in the direction of maximum radiation. IEV 712-02-02 3.1.4 field
